Research Of Dyeing And Printing With Natural Dye On Wool Fabric

With the development of our lives, more and more people concern about environmental issues,and pay more attention to their health. The properties of natural dyes are color soft, non-toxic, biodegradable, and environmental compatibility.The study of natural dyes for wool fabric dyeing technique has been widely reported,but there are also many shortcomings of natural dyes such as color yield, poor color fastness should be further addressed. In addition, studies of natural dyes printing on wool fabric in our country is still a blank, especially the replacement of high ammonia urea value aid with eco-aid is an urgen need.This paper studied the methods of natural dyes on wool fabrics,especially the way of improving the dyed fabric color yield and fastness,and studied the ecological process of natural dyes for wool fabric printing.Firstly,this paper took shellac red, cochineal red, water-soluble turmeric as the research object, studied the process of natural dyes on wool fabrics, including the type of mordant, mordant and tannic acid sequence as fastness improver to give and the amount of color fastness of. The results showed that: with the application mordant and tannic acid,it was possible to ensure color yield and got the improvement of color fastness.Took the shellac red as example,the fastness of wool fabric which with the using of tannic acid with iron bath after mordant dyeing was better than it with direct staining.,soaping color fastness improved half level and above, sunlight color fastness improved 1 level.Taking color-printed fabrics feature value index as research object, we studied the printing process with natural dyes on wool,and choose the best hygroscopic agent and acid agent, optimized the process of the printing on wool with natural dyes.The results showed that we can get better printing effect with the using of glycerinum and NaPCA as hygroscopic agent and with the using of citric acid and acetic acid as the acid agent. Took the sorghum red as example,the ingredients were guar collagen paste 100 g、water25 g、 the amount of sodium pyrrolidone carboxylic acid 2 g、the amount of citric acid 2.5 g、the amount of dye 6 g、the best steaming process: steaming temperature was 100 ℃、the steaming humidity was 100%、steaming time was 10 min.Further studied the effect of pre- mordant and adding tannic acid on the color yield and color fastness of wool fabric with mulberry red, water-soluble turmeric, gardenia blue. The results showed that the pre- mordant have positive effect on printing on wool fabric with natural dyes, with the effect of pre-mordant the color yield of fabric printing with mulberry red was improved and the soaping color fastness of wool fabric with water-soluble turmeric and gardenia blue raise half level, the application metal ions and tannic acid had positive effect on the printing on wool fabric with mulberry red and water-soluble turmeric,and the sunlight color fastness improved half level and1 level. but still could not meet the requirements of clothing textiles, how to effectively improve the natural dye printing color fastness, particularly the method of light fastness to be further exploration efforts.